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RE: [Xen-users] SCSI and ATA not working in Linux-Dom0 (Xen 3.0)

To: "Frank Burkhardt" <fbo2@xxxxxxx>, <xen-users@xxxxxxxxxxxxxxxxxxx>
Subject: RE: [Xen-users] SCSI and ATA not working in Linux-Dom0 (Xen 3.0)
From: "Ian Pratt" <m+Ian.Pratt@xxxxxxxxxxxx>
Date: Sun, 11 Dec 2005 18:32:49 -0000
Cc: ian.pratt@xxxxxxxxxxxx
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Thread-topic: [Xen-users] SCSI and ATA not working in Linux-Dom0 (Xen 3.0)
> after some days of trying and failing ... and googling, I 
> finally decided to
> post this question here.
> Why is SCSI and IDE not working in a Dom0 (Linux-Kernel 
> 2.6.12) in Xen 3.0?
> This is my system:
>    * (relly cheap) SIS-based Mainboard (Elitegroup K6 SOM+) 
> with non-swappable Duron XP 1400+ .
>    * Adaptec 2940U SCSI Controller (using the _new_ aic7xxx-driver)
>    * A SCSI harddisk (36GB, Seagate)
>    * 512MB RAM
> There are not problems when with those kernels:
>    * (non-Xen)
>    * (Xen 2.0.7)
> There's no chance to boot the kernel acpi-enabled, acpi=off 
> is mandatory on
> this system. The boot process stops with this message:
>  Cannot open root device "sda2" or unknown-block(0,0)

That's pretty odd. I'd have put money on you putting the acpi=off line
on the kernel command line rather than Xen's, but it looks like you have
it right.

Have you checked to see whether there's a BIOS update that fixes the
acpi issues? Turning acpi off should only be used as a last resort.

Also, have you tried booting from the demo CD and having a poke around.
Does it see your hardware OK?

> Which is comprehensible - because the SCSI-adapter was not recognised.
> Here is the grub-entry:
>  title XEN-3 Linux
>  kernel /boot/xen-3.0.0.gz dom0_mem=200000 noreboot acpi=off
>  module /boot/xen-linux- 
> root=/dev/sda2 ro console=tty0
> The Dom0-Kernel is the one which is built when I 'make kernels' in the
> xen-3.0-source.
> The word 'scsi' doesn't appear among the boot messages. It's 
> like SCSI is
> turned off completely - but it isn't. Same for IDE: The 
> IDE-drivers are
> compiled statically into the kernel, too. But there's no sign of IDE
> controllers being recognised when Dom0 boots.
> Is it possible that there are no PCI devices available? Maybe 
> some implicit
> "physdev_dom0_hide='*'" ? What can I do to get the 
> SCSI-adapter working?
> Thank you for any help.
> Regards,
> Frank
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